Question

我有一个表，供用户担任角色，它只是用户可以使用的两个角色之一。

CREATE TABLE [dbo].[webpages_UsersInRoles] (
    [UserId] INT NOT NULL,
    [RoleId] INT NOT NULL,
    CONSTRAINT [PK_dbo.webpages_UsersInRoles] PRIMARY KEY CLUSTERED ([UserId] ASC, [RoleId] ASC),
    CONSTRAINT [FK_dbo.webpages_UsersInRoles_dbo.webpages_Roles_RoleId] FOREIGN KEY ([RoleId]) REFERENCES [dbo].[webpages_Roles] ([RoleId]) ON DELETE CASCADE
);
CREATE TABLE [dbo].[webpages_Roles] (
    [RoleId]                     INT            IDENTITY (1, 1) NOT NULL,
    [RoleName]                   NVARCHAR (MAX) NULL,
    [webpages_Membership_UserId] INT            NULL,
    CONSTRAINT [PK_dbo.webpages_Roles] PRIMARY KEY CLUSTERED ([RoleId] ASC),
    CONSTRAINT [FK_dbo.webpages_Roles_dbo.webpages_Membership_webpages_Membership_UserId] FOREIGN KEY ([webpages_Membership_UserId]) REFERENCES [dbo].[webpages_Membership] ([UserId])
);

在我的代码中，我尝试从UsersInRoles删除用户但是我一直从我的tempdata中收到错误：

角色出错。必须传递的主键值数量匹配实体上定义的主键值的数量。参数 name：键值

这是我正在使用的代码：

        string pid = form["pid"];

        try
        {
                if (ModelState.IsValid)
                {
                Provider cprovider = _db.Providers.Find(pid);
                var UserId = cprovider.UserProfileId;


                try
                {
                    webpages_Membership cmembership = _db.webpages_Memberships.Find(UserId);
                    _db.webpages_Memberships.Remove(cmembership);
                    _db.SaveChanges();
                }
                catch (Exception ex)
                {
                    TempData["Message"] = "Error occured with membership." + ex.Message;
                }
                try
                {
                    UserProfile cprofile = _db.UserProfiles.Find(UserId);
                    _db.UserProfiles.Remove(cprofile);
                    _db.SaveChanges();
                }
                catch (Exception ex)
                {
                    TempData["Message"] = "Error occured with profile." + ex.Message;
                }
                try // this code is causing an exception
                {
                    webpages_UsersInRoles croles = _db.webpages_UsersInRoles.Find(UserId);
                    _db.webpages_UsersInRoles.Remove(croles);
                    _db.SaveChanges();
                }
                catch (Exception ex)
                {
                    TempData["Message"] = "Error occured with roles." + ex.Message;
                }


                cprovider.UserProfileId = null;
                cprovider.PendingActivation = null;
                cprovider.Activated = null;
                cprovider.Email = null;


                    _db.Entry(cprovider).State = EntityState.Modified;
                    _db.SaveChanges();
                }
            }

Answer 1

您的Find方法调用缺少参数 - 它需要UserId和RoleId：

_db.webpages_UsersInRoles.Find(UserId, RoleId)

如果您的目标是删除所有用户的角色，请不要使用find方法，请使用Where w / RemoveRange：

var croles = _db.webpages_UsersInRoles.Where( uir => uir.UserId == UserId );
_db.webpages_UsersInRoles.RemoveRange( croles );

传递的主键值的数量必须与实体上定义的键值匹配

1 个答案: